Fixes

[cdealti]

Minor fixes for the Maven build:

• Importing javase projects in Eclipse as Maven Projects results in errors in the workspace. For example:

The method endpointRemoved(ZigBeeEndpoint) of type ZigBeeApi must override a superclass method

Quick fix: Remove @Override annotation

The @Override annotation was introduced in Java 6 but for some reason Eclipse is configured with compiler source and target levels set to 1.5.

• The slf4j-api should be listed as a Maven dependency. I added this only to the Maven build.
• Add instructions to the zigbee-api Maven build to add the OSGi headers to the MANIFEST of the jar artifact. In this way the zigbee-api jar can be immediately consumed as an OSGi bundle.

[cdealti]

@Brhett the compiled (by this Maven build) classes have major version: 50 which means Java 6. Also, running the console with a Java 6 JVM works. So I cannot see any runtime dependencies from Java 7.

As said above, Eclipse is now set with source compatibility level set to 1.6 and I cannot see any compilation errors.

So I think zigbee4java can target Java 6.

[Brhett]

@cdealti So I think the README.md should be updated about the prerequisite of Java version.

[cdealti]

See also #70